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Strobila, stro-bī′la, n. a discomedusan at the stage succeeding the scyphistoma: a segmented tapeworm.—adj.

These three phases of growth, before the relation between them was understood, have been mistaken for distinct animals, and described as such under the names of Scyphistoma, Strobila, and Ephyra.

Strobila of a Discophore; Aurelia flavidula.

It is not strange that the relation between the various phases of this extraordinary series of metamorphoses, so different from each other in their external aspects, should not have been recognized at once, and that this singular Acaleph should have been called Scyphostoma in its simple Hydroid condition, Strobila after the transverse division of the body had taken place, Ephyra in the first stages of its free existence, and Aurelia in its adult state,—being thus described as four distinct animals.

In this condition our Jelly-Fish has been called Strobila.